foot with turn restrictions leads to NPE for CH preparation

[karussell]

Did a planet-wide import with 8.0, foot and turn restrictions and this leads to:

Caused by: java.lang.NullPointerException: Cannot read field "prepareEdge" because "edgeTo.parent" is null
        at com.graphhopper.routing.ch.EdgeBasedNodeContractor.addShortcutsToPrepareGraph(EdgeBasedNodeContractor.java:304)
        at com.graphhopper.routing.ch.EdgeBasedNodeContractor.addShortcutsToPrepareGraph(EdgeBasedNodeContractor.java:307)
        at com.graphhopper.routing.ch.EdgeBasedNodeContractor.addShortcutsToPrepareGraph(EdgeBasedNodeContractor.java:307)
        at com.graphhopper.routing.ch.EdgeBasedNodeContractor.findAndHandlePrepareShortcuts(EdgeBasedNodeContractor.java:224)
        at com.graphhopper.routing.ch.EdgeBasedNodeContractor.contractNode(EdgeBasedNodeContractor.java:143)
        at com.graphhopper.routing.ch.PrepareContractionHierarchies.contractNode(PrepareContractionHierarchies.java:354)
        at com.graphhopper.routing.ch.PrepareContractionHierarchies.contractNodesUsingHeuristicNodeOrdering(PrepareContractionHierarchies.java:285)
        at com.graphhopper.routing.ch.PrepareContractionHierarchies.runGraphContraction(PrepareContractionHierarchies.java:163)
        at com.graphhopper.routing.ch.PrepareContractionHierarchies.doWork(PrepareContractionHierarchies.java:133)

(foot with turn restriction might look nonsensical at the first look but curbside might be interesting)

after several hours of CH preparation:

2023-12-15 01:00:56.266 [foot] INFO  c.g.r.c.PrepareContractionHierarchies - edge, nodes: 370,124,857, shortcuts:          0, updates:  0, checked-nodes:          0, t(total): 3584.44,  t(period): 3251.41, t(lazy):   0.00, t(neighbor):   0.00, t(contr):   0.00, t(other) : 333.02, dijkstra-ratio:  45.44%, degree_approx: 1.3, priority   : time: 3189.68s, nodes: 350,952,257, trees: 1,552,461,849, searches:   6,610,614,793, capped: 4,156,515,492 (62.88%), polled: avg   5.2 max      6, explored: avg  11.2 max    180, updated: avg   0.0 max    283, contraction: time:    0.00s, nodes:          0, trees:            0, searches:               0, capped:            0 (  NaN%), polled: avg NaN max      0, explored: avg NaN max      0, updated: avg NaN max      0, totalMB:156374, usedMB:116501
...
2023-12-15 19:28:59.464 [foot] INFO  c.g.r.c.PrepareContractionHierarchies - edge, nodes: 24,623,911, shortcuts: 1,153,441,847, updates:  0, checked-nodes: 444,149,832, t(total): 70067.63,  t(period): 3251.41, t(lazy): 15359.44, t(neighbor): 33873.68, t(contr): 17078.82, t(other) : 504.28, dijkstra-ratio:  66.95%, degree_approx: 6.2, priority   : time: 51993.98s, nodes: 1,148,440,623, trees: 8,099,636,315, searches:  74,234,426,796, capped: 25,540,019,909 (34.40%), polled: avg  13.0 max     74, explored: avg  31.1 max    214, updated: avg   2.8 max    685, contraction: time: 17064.84s, nodes: 345,500,946, trees: 1,719,077,983, searches:  13,315,667,557, capped:   13,244,000 ( 0.10%), polled: avg  26.9 max   2393, explored: avg  47.4 max   2665, updated: avg   5.2 max  10448, totalMB:203788, usedMB:188303

config:

graphhopper:

  # OpenStreetMap input file PBF or XML, can be changed via command line -Ddw.graphhopper.datareader.file=some.pbf
  datareader.file: ""
  # Local folder used by graphhopper to store its data
  graph.location: graph-cache


  profiles:
    - name: foot
      vehicle: foot
      turn_costs: true
      custom_model:
        distance_influence: 70

  profiles_ch:
    - profile: foot

  profiles_lm: []

  prepare.min_network_size: 200
  prepare.subnetworks.threads: 1

  # You can limit the max distance between two consecutive waypoints of flexible routing requests to be less or equal
  # the given distance in meter. Default is set to 1000km.
  routing.non_ch.max_waypoint_distance: 1000000

  import.osm.ignored_highways: '' # typically useful for motorized-only routing

  graph.dataaccess.default_type: RAM_STORE